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UCD9240 Output Off!!!

Manfred Moses
Prodigy 20 points

Hello,

I configured 3 rails (1,0V, 1,8V and 2,5V) by using the Fusion design tool and the TI UCBtoGPIO adapter. Writing to hardware is okay. The Monitor function works but the 3 outputs are off.

The On/Off config is: always converting

No tracking

Vin is ok, all Vout are 0.7V (unstable)

What did I wrong? Can anybody help me?

 

Thanks

Manfred

  • 0
    Prodigy 20 points

    Hi,

    reading other postings I found out that I have forgotten to edit the design page of th GUI. I attached a module to each rail and I edited the schematic design. I wrote the changes I did to the hardware and flash programming as well.

    But nothing happened to the outputs, they are still OFF, that's what the STATUS REGISTER/LINES reports to me (MISC: Output Off, POWER_GOOD, Reset REquired???)

    VIN is ok. I wonder about the Vin scale factor. While I set the input resistor ratio in the schematic (10k / 2k) I need to set the scale factor to 0,167 so that my Vin = 12V is reported correctly in the MONITOR function of the GUI.

    The output voltages of all rails are approximately 0,9V ( instead of 1,0V, 1,8V and 2,5V). These 0,9V cannaot carry any current. They break down.

    Is there anywhere a switch to turn the outputs on? But I assume there is still a great error in my design or I forgot to determine an important feature.

    How can I check my design for errors?

     

    Thanks,

    Manfred

  • 0 in reply to Manfred Moses
    TI__Genius 13700 points

    The VIN scale factor is correct at .167 for the resistor  values listed.

    Having selected the modules you have installed and updated the Edit Full Power Stage in Schematic to reflect the values populated in your design for VIN, Vout and CS sensing.  Also, the voltage sensed across EA_P/EA_N can only be a maximum of 1.6V (use 1.4V as max nominal to allow for transient conditions), this will require that the 1.8V and 2.5V rail each has a voltage divider feeding the error amp feedback pins (EA_P/EA_N), which needs to be reflected in the Power Stage Schematic.

     

    Check the CLA Coefficient Banks tab of the Configure page to see if the compensation was properly stored, if the the Hardware Banks have zeros listed for the first few Floating Points parameters (B01,B11,B21)  then the compensation wasn't stored.  If this is the case then go back to the Design page and make sure a Write to Hardware is performed before saving the file.

     

    Also, check the IOUT, VIN, TEMP CONFIG tab of the Configure page to make sure the Over-Current settings have been set properly, this may be the reason the rails cannot be loaded.